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Interferometry is a vital tool for studying fundamental features in thequantum Hall effect (QHE). For instance, Aharonov-Bohm (AB) interference in aquantum Hall interferometer can probe the wave-particle duality of electronsand quasiparticles. Here, we report an unusual AB interference in a quantumHall Fabry-P\'erot interferometer (FPI), whose Coulomb interactions weresuppressed with a grounded drain in the interior bulk of the FPI. In adescending filling factor from $\nu =3$ to $\nu\approx5/3$, the magnetic fieldperiodicity, which corresponded to a single 'flux quantum,' agreed accuratelywith the enclosed area of the FPI. However, in the filling range,$\nu\approx5/3$ to ${\nu}=1$, the field periodicity increased markedly, apriorisuggesting a drastic shrinkage of the AB area. Moreover, the modulation gatevoltage periodicity decreased abruptly at this range. We attribute theseunexpected observations to a ubiquitous edge reconstruction, leading todynamical area changing with the field and a modified modulation gate-edgecapacitance. These results are reproducible and support future interferenceexperiments with a QHE-FPI.

Anomalous Aharonov-Bohm Interference in the Presence of Edge Reconstruction